Display cooler and freezers that are open to the air have refrigeration compressors that must work continuously to keep them cold. An open display unit compressor can run up to 24 hours per day.
It's fairly easy to calculate the amount of expected heat recovery and savings obtainable from a display cooler or freezer by using the HotSpot performance data along with the compressor size and daily run time. You can determine your approximate daily BTU recovery by multiplying the tons of capacity by the run time and then multiply this by the BTU per ton data.
For example, a customer with average entering water temperature of 70F, with a 5 ton display cooler compressor running an average of 22 hours per day year round could recover BTUs as follows:
BTU recovery per ton = 3053
Unit size = 5 tons
Hours run per day = 22
BTU recovery per day =
335,830 BTU per day
BTU recovered in a 30 day month
= 10,074,900 per month
10,074,900 BTU per month = 2,955 kWh per month
If your cost per kWh is $.10 your water heating energy savings would be
$295.50 per month or $3,594 per year.
Find out more....
Commercial Display Cooler/Freezer users click here
See: Commercial HRU Specification 1.5 to 100 tons
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